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Capabilities Anywhere: can physically move around without affecting data availability Anytime: can store and retrieve any data whenever mobile connection is available Efficiency: can process mobile data efficiently Effectiveness: can give users what they really want (, and skip the less relevant…)

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Goal To build a ubiquitous information processing system given the inherent limitations of mobile devices and wireless communications

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Location dependent query A query whose result depends on the geographical location of the query origin –E.g. What are the 3 nearest gas stations or restaurants? What is the shortest path to the park? –GPS can facilitate this Outdoor only WLAN could cover most of the indoor locality

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Location aware query A query whose context might be related to locations –E.g. Find out all the car plates passing through the traffic light between 7:00-8:00pm Find out the current location of the bus on route #212 Find out the top 5 road segments that have the most traffic in Taipei (the slowest car speed)

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Query constraints Query response time –Realtime query Search-result accuracy –Distance, time, path, traffic flow, … Throughput: number of queries per time unit –Scalability: large number of simultaneous queries

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Mobile concurrency control Similar to the issues of concurrency control in distributed systems –Time synchronization Timestamps, clocks –Latency in mobile queries –Similar issues to cache consistency Size of query results

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